Can cancer return after you've had a unilateral mastectomy; chemo; Herception, inhibitor?

Unfortunately yes, 7 years ago mastectomy, level 2 clearance, chemo, radiation, tamoxifen 5 years, aromasin and Zoladex 1 year. New primary in left breast that changed from hormone positive to triple negative, mets to liver and multiple bones. Just stay healthy and live life. What will be will be.